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Joeanne added: "We also include weight ranges on pack as a guide based on average weight, size and absorbency requirements.

"The + nappies carry a slightly higher weight range than the standard version as the extra absorbency means they would also be suitable for a child who is a little heavier, but does not yet require the next size up.

"Alongside our weight guide we’ve updated our designs to include a waist size guide to help parents judge if they are getting the best fit to prevent leaks.”

She said Asda has recently updated its Little Angels packs to include a description of what the + means, so that customers will see ‘+ = more absorbency’.